一种行为级的仿真方法及Sigma-Delta模数转换器的最优化设计(英文)  

A Behavioral Simulation Method and an Optimized Design of Sigma-Delta ADC

作　　者：张信[1] 于敦山[1] 盛世敏[1] 谭志超[1] 

机构地区：[1]北京大学微电子研究所,北京100871

出　　处：《北京大学学报（自然科学版）》2009年第2期209-214,共6页Acta Scientiarum Naturalium Universitatis Pekinensis

摘　　要：提出了一种行为级仿真方法,可以用于Sigma-Delta模数转换器系统级和行为级设计。与传统的行为级设计方法相比,该方法拥有更高的速度,更加易于使用,并且对于行为级设计来说有更高的效率。采用这种仿真方法,能详细分析模拟电路单元的非理想特性如积分器、比较器、运算放大器等,有助于实现高性能设计。为了验证该设计方法的有效性,设计了一个二阶Sigma-Delta模数转换器,并采用0.13μm混合信号CMOS工艺进行了流片。测试结果显示,调制器可以实现77.2dB的最高信噪比,相当于12.5位量化精度,而功耗仅为5.9mW(包括抽取滤波器为6.2mW)。A behavioral simulation method is proposed for both system level and behavioral level design of Sigma-Delta ADCs （analog to digital converters）. Compared with traditional behavioral simulation methods, the proposed method has a higher simulating speed and is more efficient in the behavioral design. With this simulation method, the imperfections of the analog cells as integrators, comparator, and the Op-Amps are analyzed in detail, which guides the design towards high performance. As a proof for the effectiveness of this method, a second-order Sigma-Delta modulator was designed and fabricated using a 0.13μm mixed signal CMOS technology.The test results show that the modulator can achieve a peak SNR of 77.2 dB,which equals to a 12.5 bit resolution, and a power dissipation of 5.9 mW （6.2 mW with decimator） was occupied.

关 键 词：行为级仿真 电路非理想特性 SIGMA-DELTA模数转换器 

分 类 号：TN792[电子电信—电路与系统]